If it's like my Bersa 45, the problem is easy to find. Force it to shoot through a mag or 2. Take the slide off and look inside at the long block to the rear. I think the firing pin goes through that, not sure though, If that block is scored on the bottom by the shell casings it will look coppery. buff that part and will fix. Not much though. that controls how tight of group you get. I overdid mine enough to double the size of my groups, so be careful. It does not jamb at all anymore. As it got hotter I guess the shells were dragging the slide and keeping it from going to battery.